Class SafeSplineSurgeCurve

java.lang.Object

neqsim.process.equipment.compressor.BoundaryCurve

neqsim.process.equipment.compressor.SurgeCurve

neqsim.process.equipment.compressor.SafeSplineSurgeCurve

All Implemented Interfaces:

Serializable, BoundaryCurveInterface

public class SafeSplineSurgeCurve
extends SurgeCurve

Spline based implementation of the surge curve with safe extrapolation.

Author:

esol

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
private org.apache.commons.math3.analysis.UnivariateFunction	flowFromHead
private org.apache.commons.math3.analysis.UnivariateFunction	headFromFlow
private boolean	isSinglePoint	Flag indicating single-point surge (for single-speed compressors).
(package private) static org.apache.logging.log4j.Logger	logger
private static final long	serialVersionUID
private double	singleSurgeFlow	Single surge flow value used when isSinglePoint is true.
private double	singleSurgeHead	Single surge head value used when isSinglePoint is true.
private double[]	sortedFlow
private double[]	sortedHead

Fields inherited from class BoundaryCurve

chartConditions, flow, flowFitter, flowFitterFunc, head, isActive

Constructor Summary

Constructors

Constructor	Description
SafeSplineSurgeCurve()	Default constructor.
SafeSplineSurgeCurve(double[] flow, double[] head)	Create a spline based surge curve from flow and head arrays.

Method Summary

Modifier and Type	Method	Description
double	getFlow(double headValue)	Get the flow corresponding to a given head value on the curve.
double	getSingleSurgeFlow()	Get the single surge flow value for single-speed compressors.
double	getSingleSurgeHead()	Get the single surge head value for single-speed compressors.
double[]	getSortedFlow()	Getter for the field sortedFlow.
double[]	getSortedHead()	Getter for the field sortedHead.
double	getSurgeFlow(double headValue)	Get the surge flow for a given head.
double	getSurgeHead(double flowValue)	Get head value corresponding to a given flow.
boolean	isSinglePointSurge()	Check if this surge curve represents a single-point surge (for single-speed compressors).
boolean	isSurge(double headValue, double flowValue)	Check if the given point is in surge.
void	setCurve(double[] chartConditions, double[] flow, double[] head)	Define the curve from arrays of flow and head values with optional chart conditions.

Methods inherited from class SurgeCurve

isLimit

Methods inherited from class BoundaryCurve

equals, getFlow, getHead, hashCode, isActive, setActive

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Field Details

serialVersionUID

private static final long serialVersionUID

See Also:

• Constant Field Values

logger

static org.apache.logging.log4j.Logger logger

sortedHead

private double[] sortedHead

sortedFlow

private double[] sortedFlow

headFromFlow

private transient org.apache.commons.math3.analysis.UnivariateFunction headFromFlow

flowFromHead

private transient org.apache.commons.math3.analysis.UnivariateFunction flowFromHead

isSinglePoint

private boolean isSinglePoint

Flag indicating single-point surge (for single-speed compressors). When true, surge flow is constant regardless of head.

singleSurgeFlow

private double singleSurgeFlow

Single surge flow value used when isSinglePoint is true.

singleSurgeHead

private double singleSurgeHead

Single surge head value used when isSinglePoint is true.

Constructor Details

SafeSplineSurgeCurve

public SafeSplineSurgeCurve()

Default constructor.

SafeSplineSurgeCurve

public SafeSplineSurgeCurve(double[] flow,
 double[] head)

Create a spline based surge curve from flow and head arrays.

Parameters:

flow - array of flow values

head - array of head values

Method Details

getSortedHead

public double[] getSortedHead()

Getter for the field sortedHead.

Returns:

an array of

invalid reference

double

objects

getSortedFlow

public double[] getSortedFlow()

Getter for the field sortedFlow.

Returns:

an array of

invalid reference

double

objects

setCurve

public void setCurve(double[] chartConditions,
 double[] flow,
 double[] head)

Define the curve from arrays of flow and head values with optional chart conditions.

Specified by:

setCurve in interface BoundaryCurveInterface

Overrides:

setCurve in class BoundaryCurve

Parameters:

chartConditions - conditions for the reference curve, or null

flow - array of flow values

head - array of head values

getFlow

public double getFlow(double headValue)

Get the flow corresponding to a given head value on the curve.

Specified by:

getFlow in interface BoundaryCurveInterface

Overrides:

getFlow in class BoundaryCurve

Parameters:

headValue - the head value

Returns:

the corresponding flow

getSurgeFlow

public double getSurgeFlow(double headValue)

Get the surge flow for a given head.

Wrapper retaining old API.

Overrides:

getSurgeFlow in class SurgeCurve

Parameters:

headValue - head value

Returns:

surge flow

getSurgeHead

public double getSurgeHead(double flowValue)

Get head value corresponding to a given flow.

Parameters:

flowValue - flow value

Returns:

corresponding head

isSurge

public boolean isSurge(double headValue,
 double flowValue)

Check if the given point is in surge.

Wrapper retaining old API.

Overrides:

isSurge in class SurgeCurve

Parameters:

headValue - head value

flowValue - flow value

Returns:

true if the point is in surge

isSinglePointSurge

public boolean isSinglePointSurge()

Check if this surge curve represents a single-point surge (for single-speed compressors).

Returns:

true if this is a single-point surge curve

getSingleSurgeFlow

public double getSingleSurgeFlow()

Get the single surge flow value for single-speed compressors.

Returns:

the single surge flow value, or 0.0 if not a single-point surge

getSingleSurgeHead

public double getSingleSurgeHead()

Get the single surge head value for single-speed compressors.

Returns:

the single surge head value, or 0.0 if not a single-point surge